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Exo-Terra Reptile UVB 150 13W

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The numbers 100, 150 & 200 refer to the average UVB output at 4" or 10 cm from the bulb. All our new UVB bulbs have been designed for maximum vitamin D3 photosynthesis, by concentrating the UVB output near the 294 nm within the UV output. At this wavelength vitamin D3 synthesis is most active!